package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.dao.BrandDao;
import com.atguigu.gulimall.product.dao.CategoryDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;


import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
    @Autowired
    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

        @Override
    public List<CategoryEntity> listWithTree() {
        //寻找所有菜单
        List<CategoryEntity> categoryEntities = categoryDao.selectList(null);
        //寻找所有一级菜单
        List<CategoryEntity> levle1=categoryEntities.stream()
                .filter(categoryEntity->
                   categoryEntity.getParentCid()==0)
                .map((menu)->{
                    menu.setChildren(getChildrens(menu,categoryEntities));
                    return  menu; })
                .sorted((menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
                })
               .collect(Collectors.toList());
        ;

        return levle1;
    }



    /**
     * 递归查找所有菜单的子菜单
     */
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children= all.stream().filter((categoryEntity)->{
           return categoryEntity.getParentCid()==root.getCatId(); })
                .map((categoryEntity)->{
                   categoryEntity.setChildren(getChildrens(categoryEntity,all));
                    return categoryEntity; })
                .sorted((menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
                })
                .collect(Collectors.toList());

        return children;
    }
    @Override
    public  void removeMenuByIds(List<Long> asList) {
        //TODO 1.检查当前删除的菜单，是否被别的地方引用
        //逻辑删除
        categoryDao.deleteBatchIds(asList);
    }

}